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Interphone using extention calling only.

Can any let me know how many peer-to-peer extention calls I can have at one time using the free version? I know I have an unlimited number of creating extentions, but can I call between extentions? I am looking to using the IP PBX only for a interphone solution with a closed condominium of approximately 350 extentions. I would never see having more than 20 call in progress at one time. Thanks in advance!